• 유기물자원화
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• 제11권4호
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• pp.66-78
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• 2003

갓 발생한 하수슬러지를 전처리 없이 줄지렁이에게 급이할 경우 하수슬러지 발생지역과 무관하게 슬러지 급이 32일~45일 경과후 지렁이 개체군의 치사현상이 일어났다. 하수슬러지내 중금속, 고분자 유기응집제(폴리아크릴 아마이드) 또는 미생물 생체가 직접적인 독성 물질로 작용하지는 않는 것으로 나타났다. 하수슬러지를 수분률 65%가 되도록 제지슬러지와 혼합하여 21일 이상 부숙시킨 먹이에서는 지렁이 개체군에 대한 생태독성 현상이 유발되지 않았으며 하수슬러지에 인분케익을 혼합하여 부숙시킨 먹이를 공급한 경우보다 지렁이의 폐기물 처리속도와 지렁이 생체량 증가율이 높았다.

• 유기물자원화
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• 제4권2호
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• pp.47-53
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• 1996

난지도 하수슬러지 매립지 내 슬러지의 적정 처리방안을 검토하기 위한 기초조사로서 슬러지의 매립량 및 성상을 조사하였다. 보링시험을 통하여 매립지의 깊이를 측정하였고 슬러지성상분석을 위한 시료를 채취하였다. 주요 분석내용은 슬러지의 화학적 특성, 중금속함량 그리고 용출시험이었다. 조사결과 슬러지 매립지는 평균 15m 깊이에 약 5만 평방미터 넓이로 총 매립량은 60만톤 정도로 추정되었다. 슬러지의 성상을 분석한 결과 일반적인 하수슬러지에 비하여 상당히 안정화된 슬러지임을 알 수 있었다. 또한 중금속 함량 시험에서 구리를 제외한 모든 항목에서 미국 캘리포니아주의 일반폐기물기준을 만족하였으며, 외국의 퇴비내 중금속허용기준치와 비교한 결과 대부분 기준치 이내이었다. 슬러지의 용출시험결과 난지도 하수슬러지매립장의 슬러지는 일반폐기물로 분류되었다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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• pp.29-32
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• 2014

The practical route for disposal of sewage sludge becomes energy recovery by combustion after its ocean dumping is banned in 2012 in Korea. Due to the high moisture content, however, sewage sludge is required to be dried before transport and combustion. In this study, pyrolysis and combustion characteristics of dried sewage sludge was investigated in a small-scale fixed bed reactor in order to provide fundamental data for energy recovery of the fuel. As the first step of combustion, the primary products of pyrolysis were analyzed in a fixed bed reactor for the condensable volatiles (tar), non-condensable gases, and char. For the combustion characteristics, another fixed bed reactor was constructed to monitor the weight and temperature of the fuel particles during ignition and combustion under different air flow rates. The test results were used to derive the ignition and burning rates.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
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• pp.687-690
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• 2004

The discharge of sewage sludge ash that is rapidly increasing in Korea. The utilization of sewage sludge ash would contribute to the elimination of an environmental problem and to the development of new high-performance materials. So the paper is focused on an experimental study in order to investigate the utilization of sewage sludge ash as the construction materials. It achieves leaching test, chemical composition and compressive strength test. As a result of tests, the sewage sludge ash has sufficient potential for use of pozzolanic raw material. However. it is judged to be available to construction material if research is continuously gone.

• Applied Biological Chemistry
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• 제41권2호
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• pp.181-186
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• 1998

하수처리 운전이 슬러지 특성에 미치는 영향을 실제규모 하수처리장에서 수행하였으며 하수 슬러지 특성변화가 퇴비화 원료로 이용될 경우 그 영향을 조사, 분석하였다. 천안 하수처리장은 가동 초기 1년동안 정상적으로 운전되고 있으며 유출수는 방류수 수질기준을 만족하고 있으나 유입유량의 증가로 인하여 처리장 증설이 시급하다. 슬러지 탈수시설인 Belt press의 용량부족으로 하수처리장 내 비휘발성 고형물이 순환, 농축되어 활성 슬러지 MLSS 증가와 이에 따라 F/M비가 감소되게 운전하는 결과를 초래하고 있으며 이러한 상태로 하수처리장이 장기간 운전될 경우 하수처리 시설의 효율저하가 우려된다. 하수 슬러지의 수분함량은 79.5%, 유기물 함량은 11.6 %, C/N비는 6.1이었으며 중금속으로 As 1.8 mg/kg, Cd 27 mg/kg, Hg <0.1 mg/kg, Pb 54 mg/kg, T-Cr 370 mg/kg과 Cu 1,100 mg/kg이 검출되었다.하수 슬러지는 퇴비화 적정조건을 만족할 수 있는 원료로서 사용되기 위하여 수분함량, 유기물 함량 그리고 C/N비의 조절이 필요하며 이를 위한 첨가제/팽화제의 첨가가 필수적이다. 하수처리장 유입수에 함유된 중금속은 대부분 하수 슬러지에 농축되며 퇴비화 원료로 사용될 경우 부산물비료로서 규격기준에 적합하지 않을 뿐만아니라 토양오염이 우려되므로 유입수의 중금속 발생원을 추적, 제거하는 방안이 검토되어야 한다.

• Journal of Microbiology and Biotechnology
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• 제24권11호
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• pp.1542-1550
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• 2014

Co-digesting molasses wastewater and sewage sludge was evaluated for hydrogen production by response surface methodology (RSM). Batch experiments in accordance with various dilution ratios (40- to 5-fold) and waste mixing composition ratios (100:0, 80:20, 60:40, 40:60, 20:80, and 0:100, on a volume basis) were conducted. Volatile solid (VS) concentration strongly affected the hydrogen production rate and yield compared with the waste mixing ratio. The specific hydrogen production rate was predicted to be optimal when the VS concentration ranged from 10 to 12 g/l at all the mixing ratios of molasses wastewater and sewage sludge. A hydrogen yield of over 50 ml $H_2/gVS_{removed}$ was obtained from mixed waste of 10% sewage sludge and 10 g/l VS (about 10-fold dilution ratio). The optimal chemical oxygen demand/total nitrogen ratio for co-digesting molasses wastewater and sewage sludge was between 250 and 300 with a hydrogen yield above 20 ml $H_2/gVS_{removed}$.

• 한국환경과학회지
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• 제14권4호
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• pp.413-425
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• 2005

The 16 priority PAHs (Polycyclic Aromatic Hydrocarbons) designated by US Environmental Protection Agency were analyzed for some digested sludges from wastewater treatment plants in Korea. PAHs are an important group of organic contaminants present in sewage sludge due to their persistence and toxic potential. PAHs were extracted from freeze-dried sludges using a methylene chloride-methanol (2:1) mixture in a soxhlet extractor. The extracts were cleaned-up by silica gel/alumina combination column and subsequently fed into gas chromatograph/mass spectrometer (GC/MS) for determining PAH contents. The sum of the 16 PAHs in the sewage sludge varied from 534.8 to $5754.5 {\cal}ug/{\cal}kg$, dry wt.. In the sewage sludge, phenanthrene appears as the most abundant PAHs, followed by naphthalene, pyrene, fluoranthene. Source of the investigated sewage sludges relatively predominated pyrogenic. PAHs levels of sewage sludges in Korea appeared to be lower than those in other countries.

• Environmental Engineering Research
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• 제24권4호
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• pp.591-599
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• 2019

To convert sewage sludge to energy, drying-gasification characteristics during microwave heating were studied. During the gasification of carbon dioxide, the main products were gas, followed by char, and tar in terms of the amount. The main components of the producer gas were carbon monoxide and hydrogen including a small amount of methane and light hydrocarbons. They showed a sufficient heating value as a fuel. The generated tar is gravimetric tar, which is total tar. As light tars, benzene (light aromatic tar) was a major light tar. Naphthalene, anthracene, and pyrene (light polycyclic aromatic hydrocarbon tars) were also generated, but in relatively small amounts. Ammonia and hydrogen cyanide (precursor for NO_x) were generated from thermal decomposition of tar containing protein and nitrogen in sewage sludge. In the case of sludge char, its average pore diameter was small, but specific area, pore volume, and adsorption amounts were relatively large, resulting in superior adsorption characteristics.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2004년도 총회 및 춘계학술발표회
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• pp.125-130
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• 2004

This study has been assessed the influence of applying sewage sludge to soil amendments on the sorption properties, and leaching potential of three commonly used organophosphorus pesticides, Diazinon, Fenitrothion, and Chlorpyrifos. A sandy soil with a low content of organic carbon was treated with sewage sludge with a ratio sandy soil : sludge ratio of 30:1. The sorption was determined with the batch equilibrium technique. The sorption isotherms could be described by Freundlich equation. The Freundlich constant, K value which measures sorption capacity, were 3.97, 9.94, 22.48 for Diazinon, Fenitrothion, Chlorpyrifos in non-amended soil. But in amended soil, K value was 12.58, 28.47, and 61.21 for Diazinon, Fenitrothion, and Chlorpyrifos. The overall effect of sewage sludge addition to soil was to increase pesticides adsorption, due to the high sorption capacity of the organic matter. The effect of sludge on tile leaching of pesticides in the soil was studied using packed soil columns. Total recoveries of pesticides in soil and leachate with leaching in soil column, were in the range of about 73～84%, was reduced with the passage of time. Diazinon moved more rapidly than Chlorpyrifos in the unamended soil due to greater sorption and lower water solubility of Chlorpyrifos. Total amounts of pesticides leached from the sewage sludge amended soils were significantly reduced when compared with unamended soils. This reduction may be mainly due to and increase in sorption in amended soils, as a consequence of the increase in the organic matter content.

• 대한환경공학회지
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• 제35권1호
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• pp.64-69
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• 2013

이 연구논문의 주요 목적은 하수슬러지와 생활폐기물을 혼합소각할 경우, 소각시설의 안정적 운영을 위해 가장 중요한 변수인 하수슬러지의 정량공급 방안에 관한 것이다. 실험결과, 슬럼프테스트와 유동화테스를 통해 함수율을 약 87%로 정량공급할 경우, 하수슬러지의 표면연소를 보완하여 완전연소가 이루어 질 것으로 판단되어 향후 생활폐기물과 하수슬러지 혼합소각시 소각시설의 안정화에 기여할 것으로 판단된다.